The placement of word forms in the Morphology section is different for nouns, adjectives, and verbs.
The Morphology section is present in most entries
(although several hundred entries lack a complete display of inflected forms; all these words are entirely regular).

Nouns

NSg

ASg

GSg

PSg

DSg

ISg

NPlur

APlur

GPlur

PPlur

DPlur

IPlur

If one of the lines is missing, then the forms that would have been in that line are not used.

If some of the forms are missing, then these forms are not used, although theoretically they exist.
If some of the forms are replaced with long dashes, then these forms do not exist and cannot be produced at all.

Note: The above reference can also be displayed by clicking Columns and Rows in the floating Help panel.